Differential pressure control system for variable camshaft timin

Details Differential pressure control system for variable camshaft timin Differential pressure control system for variable camshaft timin

1991-09-20

1992-12-22

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 464 2, F01L 134

Patent

active

051726599

ABSTRACT:
A camshaft (126) has a vane (160) secured to an end thereof for non-osciling rotation therewith. The camshaft tends to change in reaction to pulses which it experiences during its normal operation, and it is permitted to change only in a given direction, either to advance or retard, by selectively blocking or permitting the flow of hydraulic fluid, preferably engine oil, through the return lines (194, 196) from the recesses by controlling the position of a spool (200) within a valve body (198) of a control valve in response to a signal indicative of an engine operating condition from an engine control unit (208). The spool is selectively positioned within the valve body by controlling hydraulic loads on its opposed end, one end being subjected to full system pressure from the hydraulic source (230), the other end being subject to the action of an hydraulic pressure multiplier (234) which receives fluid from the hydraulic source by way of pulse width modulated solenoid (206) that acts to controllably reduce hydraulic system pressure in response to a signal from an engine control unit (208). The spool is centered when the hydraulic loads acting on its opposed ends are in balance by the action of springs (202, 204) that also act on the opposed ends of the spool.

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